Need help with carbeurator... - DPChallenge Forums

01/07/2005 08:31:26 PM · #1

I know I spelled it wrong lol...

ONE...are those the jets and if so how do you clean them out?

ALSO, why is one larger than the other?

//home.comcast.net/~dbpaull/carb.htm

Thanks for any help, I'm desperate.

01/07/2005 08:33:43 PM · #2

Well, I'm extremely lightheaded at the moment and my girlfriend keeps telling me I smell like gasoline. I'm going to get a shower.

Mick

Canon EOS-5D

01/07/2005 08:42:56 PM · #3

Maybe the one isn't larger than the other, but just adjusted differently. And, I may be (probably am) wrong but I don't think those are jets. They look more like air valves to me. But, I'm not a motorcycle mechanic. I suggest taking in to a real motorcycle mechanic and have it tuned up. Either that or buy the repair manual for that bike and do it yourself.

$0.02

jab119

01/07/2005 08:47:21 PM · #4

I dont think those are the jets, they might be an airflow sensor or air intake sensor of some kind.

I do beleive that the jets are behind the butterfly valve (the flapper thingy), I think the black tubes in the back ground are the fuel lines, and the jets are in there some where. you can try some of that carb cleaner spray stuff, and you can use some STP carb cleaner gas additive as well

James

01/07/2005 08:51:01 PM · #5

hrmm...ok well that's good to know.

I guess I'll look again in the morning -- no point in getting all smelly again.

jab119

01/07/2005 08:51:32 PM · #6

have you tried one of the sport bike web sites???

//www.sportbikes.net/

James

01/07/2005 09:00:55 PM · #7

I don't think those are the jets, (don't know what they are), but the jets should come in from the bottom of the bowl. It looks like you have to access them from the bottom of the carb. (I am used to Harleys where you can access them easier).

Have you tried this site?

Linda (with "backup" from my husband who wrenches on Harleys)

01/07/2005 09:02:12 PM · #8

OK I'm going to try the bike site...how's this look for the jets...

//home.comcast.net/~dbpaull/jet.jpg

//home.comcast.net/~dbpaull/jet2.jpg

That actually makes more sense as there's a rubber line going to it and it looks like I could take it off and blow through it.

Canon RF 24-70mm f/2.8 L IS

01/07/2005 09:02:47 PM · #9

What are the symptems of the problem. Those are definitely not the jets they are talking about.

This is what a jet looks like...probably not the exact jet...it's off of a mikuni carb on a yamaha.

kirbic

Canon EOS R5

01/07/2005 09:02:55 PM · #10

Those may well be the idle jets, but it sounds like you have a problem with the main jets (which are below the butterflies) if it wants to die when you burp the throttle. If the bike sat for an extended period, the jets are likely clogged with varnish. Really thorough cleaning requires removal and disassembly of the carbs. Before you embark on that, do the following:

1.) Turn off the fuel petcock
2.) Run the bike until it quits (carbs are dry)
3.) Drain the fuel tank, and refill with fresh fuel
4.) Add twice the recommended dosage level of liquid Gumout (not the spray) to the tank
5.) Start the bike, run it for a few minutes, try to get at least some fuel through the main jests by burping the throttle
6.) Shut it down, let it sit overnight
7.) Repeat next day. If it starts to get better, repeat running and letting it sit for a few hours a couple more times
8.) If you can get it to the point where you feel confident riding it, take it out and work it. It will probably get better rapidly, but may take a few days riding (1/2 hour or so per day) to get back to normal.

I've used the above procedure a couple times with success, but if things are clogged too badly, it won't help. You can then proceed to have it serviced professionally, unless you are really good mechanically.

Message edited by author 2005-01-07 21:04:07.

kennyt

Canon EOS-50D

Sigma 24-70mm f/2.8 EX Aspherical DF for Canon

01/07/2005 09:04:35 PM · #11

Those aren't jets. They are air bleeds

01/07/2005 09:06:11 PM · #12

Originally posted by BADDBOYY21:

What are the symptems of the problem. Those are definitely not the jets they are talking about.

This is what a jet looks like...probably not the exact jet...it's off of a mikuni carb on a yamaha.

Yes! The jets are in the float bowl, in the bottom of the carburetor accessed THROUGH the float bowl; the jets actually sit in the gasoline; there should be two: a main and an intermediate.
Hope this helps.

Message edited by author 2005-01-07 21:07:32.

Canon EF 16-35mm f/2.8L USM

01/07/2005 09:08:11 PM · #13

If it runs with choke on and dies with it off...its too lean. The first thing that could be adjusted is the air/fuel mixture screw. Thats the first level of adjustment...then I would say its the idle/pilot jet clogged. Usually they are very tiny and could have a spec of dirt clogging the passage.

When the choke is on...it dumps more fuel and limits the airflow.

mrorange002

Canon EOS-5D

01/07/2005 09:10:43 PM · #14

BradP is a mechanic, and might be able to help

01/07/2005 09:11:53 PM · #15

wow...I think I took on more than I can handle. I might have to invest in a manual.

I do have my associates degree in automotive technology but I just got it in 02 -- and we studied ALL fuel injection as it was through Ford and really nothing has used carbs since a long time ago heh.

Oh well, what's the worst that can happen...I might just take it apart and torque it down really tight lol.

--

kirbic, I think it's a bit late to try the gumout thing -- Now that I have it off I'm kinda deep into it (I don't know how hard getting a carb off a harley is, but on a sportbike, it's quite involved).

01/07/2005 09:14:48 PM · #16

Cleaning carbs are easy..you just need a clymer manual...it would have told you step by step what to do. Never tear a bike apart without one! Rice burners have a million parts.

Canon RF 24-70mm f/2.8 L IS

01/07/2005 09:15:31 PM · #17

Originally posted by deapee:

My husband is chuckling at you - he says to get to the bowl on a HD you don't have to take the carb off. On my husband's AHDRA drag bike, they re-jet between runs, no problem.

kirbic

Canon EOS R5

01/07/2005 09:15:34 PM · #18

Originally posted by deapee:

...kirbic, I think it's a bit late to try the gumout thing -- Now that I have it off I'm kinda deep into it (I don't know how hard getting a carb off a harley is, but on a sportbike, it's quite involved).

Yep, been there, long time ago... the sport bike, carbs, not the Harley :)

If you think getting the carbs off an in-line 4-cylinder is a biatch, try getting 'em off a Honda V4, LOL.

01/07/2005 09:18:08 PM · #19

Ive rejetted my Yamaha Banshee's probably 32423423 times. Cleaning and rejetting is simple. You won't forget after this time lol.

Canon RF 24-70mm f/2.8 L IS

01/07/2005 09:18:53 PM · #20

We happen to have a 1973 Honda 350 Four in darned good shape sitting in our garage, and WANT TO SELL IT!!

Anybody interested??? LOL!

kirbic

Canon EOS R5

01/07/2005 09:22:28 PM · #21

Originally posted by lhall:

We happen to have a 1973 Honda 350 Four in darned good shape sitting in our garage, and WANT TO SELL IT!!

Anybody interested??? LOL!

Really, a 350 four? What a unique little machine. I remember in my teens, the bike to lust after was the CB360T (twin) but the 350 Four was something REALLY special. There weren't many of those sold, and you may find it has some real value. Is it in running shape? Does it need restoration?

Prof_Fate

01/07/2005 09:25:11 PM · #22

Dave,
Bring the carbs with you tomorrow - I spent 11 years as a motorcycle tech at Tracy's and another shop.

What i think i am seeing in the pic would be the idle air screw - they are sdjustable and stick out different lengths depending on how far they are adjusted in.

Basically, if a bike is going to sit beyond 30 days, drain the carbs (DO NOT run them dry - A)fule will remain b)the bike will run leaner and leaner before it dies..not good) then add Stabil or other fule additive to a FULL fuel tank. A partly full tank will accumulate condensation and a)water in the fule will be an issue b)will rust the tank.

The main jets rarely if ever plug up. Too large. What plugs up 80% of the time are the low speed jets, they are very small. ON some bikes there is a passage for fuel from the float boal bottom into the cab body. Crap settles in teh float boal and plugs them up. In both these scenarios the bike starts, sometimes you get arond the block once, and then it will not idle without het choke on. On bikes sine the late 70s, the choke is NOT like a car choke - it is technically an enrichening circuit, letting in more fuel, bypassing the plugged passages.

If it ran when you parked it, then NO adjustments are needed - things do not go out of adjustment just sitting there. I can clean carbs in my sleep, literally.

Bring: carbs, can of gumout (spray type) #2 phillips (regular one) and a small strait blade screwdriver. If i am awake in the morning to remember i can bring my tools. Compressed air is handy, but that i cannot bring.

Running gumout will NOT fix the issue 99% of the time. Suck on a plugged up straw - you can't. Now put a chemical in teh cup that the straw is in and suck..you can't so the chemical cannot get in there to clean out the gunk.

edit: sorry about the typos. too many to fix. Dave - I sent you a PM

Message edited by author 2005-01-07 21:27:06.

01/07/2005 09:30:26 PM · #23

Originally posted by kirbic:

Originally posted by lhall:
We happen to have a 1973 Honda 350 Four in darned good shape sitting in our garage, and WANT TO SELL IT!!

Anybody interested??? LOL!

Really, a 350 four? What a unique little machine. I remember in my teens, the bike to lust after was the CB360T (twin) but the 350 Four was something REALLY special. There weren't many of those sold, and you may find it has some real value. Is it in running shape? Does it need restoration?

Definitely in running condition; had top end re-done two years ago, but has been sitting in garage since then. We were going to use it as a tow bike for our drag bike, but got something else to do that so this has just been garaged. Exterior in good shape too, but needs to be cleaned up. Has aftermarket pipes, and no rear signal lights.

We were actually looking for a Honda Trail 70 for a tow bike, but them bad boys are HIGH DOLLAR!

Prof_Fate

01/07/2005 09:31:37 PM · #24

350F - wonderful sounding and looking bike.